The Hyperloop rapid transit system would connect downtown Los Angeles with San Francisco, 380 miles away. Musk told the crowd that more details for the project would be available on June 20th. Hyperloop would be "a cross between a Concorde, a rail gun, and an air hockey table." Musk joked, "even if I'm wrong about the economic assumptions, it would be a really fun ride." Musk claimed that his imagined train system would go "3 or 4 times faster than the [California] bullet train" or twice the speed of an aircraft, shuttling people from LA to San Francisco in under 30 minutes. It's possible that the Hyperloop could even be self-powering. "If you put solar panels on it, you generate more power than you would consume in the system. There's a way to store the power so it would run 24/7 without using batteries," he said.

The technology behind the system will be a “breakthrough” and Musk will be “happy to work with the right partners,” Musk said in Twitter posts today. Musk is seeking “critical feedback” on the system and will publish it as open source, according to the tweets.

Musk previously said that the so-called Hyperloop would be twice as fast as airplane travel and cheaper than high-speed rail